Modernize ROCm CI pins: ROCm 7.2.3 + torch 2.11.0

The previous commit landed with `rocm/dev-ubuntu-22.04:6.2.4` and `torch==2.4.1` (rocm6.2 wheel index) — those are old. The verification host for this PR runs ROCm 7.2.1, and the rocm7.2 wheel index publishes `torch 2.11.0+rocm7.2` as a current stable combo. Pinning CI to match (latest available 7.2.x dev image at 7.2.3 + 2.11.0) makes the CI signal track what the port was actually validated against.

Co-Authored-By: Claude Opus 4.7 (1M context)

Author: jeffdaily

.github/workflows/build.yml

@@ -30,10 +30,10 @@ jobs:
   linux_rocm_build:
     runs-on: ubuntu-latest
     container:
-      image: rocm/dev-ubuntu-22.04:6.2.4
+      image: rocm/dev-ubuntu-22.04:7.2.3
     env:
-      PYTORCH_VERSION: "2.4.1"
-      ROCM_INDEX: "rocm6.2"
+      PYTORCH_VERSION: "2.11.0"
+      ROCM_INDEX: "rocm7.2"
     steps:
     - uses: actions/checkout@v4
     - name: Install Python and torch+rocm